Negative plate, secondary battery and electrical device
Abstract
A negative plate, a secondary battery and an electrical device, which fall within the technical field of batteries, wherein the negative plate includes a negative current collector and an anode active material layer provided on a surface of the negative current collector, the anode active material layer includes an anode active material, the anode active material includes graphite, and the negative plate satisfies the following relationship: a=ln(D FW )+10×ln(D V 50)+⅓(La)+26.5, b=PD, a/45−b≥0.05. By reasonably controlling a particle diameter distribution of the anode active material in the negative plate, as well as a crystal size and a compacted density of the negative plate, the negative plate of the present disclosure maintains good wettability at a higher compacted density and has good liquid absorption capacity for an electrolyte solution, and a battery containing the negative plate has excellent cycle life.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A negative plate, including a negative current collector and an anode active material layer provided on at least one surface of the negative current collector, the anode active material layer including an anode active material, wherein the anode active material includes graphite, and the negative plate satisfies the following relationship:
a
=
ln
(
D
F
W
)
+
1
0
×
ln
(
D
V
5
0
)
+
1
/
3
(
L
a
)
+
2
6
.
5
,
b
=
P
D
,
a
/
45
-
b
≥
0
.
0
5
,
where D FW is a full width at half maximum of a particle size volume distribution of the anode active material in a unit of μm,
D V 50 is a particle diameter corresponding to 50% of a cumulative volume distribution percentage of the anode active material in a unit of μm,
La is an average size of a crystal in an a-axis direction measured by Raman spectroscopy on the negative plate in a unit of nm, and
PD is a compacted density of the negative plate in a unit of g/cm 3 .
2 . The negative plate according to claim 1 , wherein the negative plate satisfies the following relationship: 0.06≤a/45−b≤0.15.
3 . The negative plate according to claim 1 , wherein the D FW is in a range of 10 μm to 35 μm.
4 . The negative plate according to claim 3 , wherein the D FW is in a range of 15 μm to 30 μm.
5 . The negative plate according to claim 1 , wherein the D V 50 is in a range of 5 μm to 20 μm.
6 . The negative plate according to claim 5 , wherein the D V 50 is in a range of 10 μm to 15 μm.
7 . The negative plate according to claim 1 , wherein the La is in a range of 50 nm to 80 nm.
8 . The negative plate according to claim 7 , wherein the La is in a range of 65 nm to 75 nm.
9 . The negative plate according to claim 1 , wherein the PD is in a range of 1.3 g/cm 3 to 1.8 g/cm 3 .
10 . The negative plate according to claim 9 , wherein the PD is in a range of 1.60 g/cm 3 to 1.75 g/cm 3 .
11 . The negative plate according to claim 1 , wherein the negative plate further satisfies the following relationship: 9.5≤5.5×b−ln(c)≤11.5,
where c is an ion transport impedance of the negative plate in a unit of ohms (Ω).
12 . The negative plate according to claim 11 , wherein the c is in a range of 0.05Ω to 2Ω.
13 . The negative plate according to claim 12 , wherein the c is in a range of 0.1Ω to 1.0Ω.
14 . A secondary battery, including a positive plate, a negative plate and an electrolyte solution, wherein the negative plate is the negative plate according to claim 1 .
15 . An electrical device, comprising the secondary battery according to claim 14 .Join the waitlist — get patent alerts
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